CVE-2026-99286

Description

In the Linux kernel, the following vulnerability has been resolved: xen-netback: Fix XenBus connection failure cleanup xenvif_get_stats and xenvif_get_ethtool_stats capture vif->num_queues under rcu_read_lock. We need to unpublish vif->num_queues before synchronize_net to ensure that readers that come afterwards will not read a non-zero vif->num_queues and attempt to access invalid queues. This is the same cleanup algorithm as used in backend_disconnect and added in commit b17075d5c198 ("xen-netback: fix race condition on XenBus disconnect"). This is XSA-531

References

• https://git.kernel.org/stable/c/07aca7d25ce8578fedde49855983a01c537a782b
• https://git.kernel.org/stable/c/a97aa838903d15f865d80809f5198ff459c6634a
• https://git.kernel.org/stable/c/ade3082dcdee17c5767069883936d64ff83f6c9f
• http://www.openwall.com/lists/oss-security/2026/11/10/25
• http://xenbits.xen.org/xsa/advisory-531.html